Pirnting quality issues

I am having a problem with Magenta streaks running through all of my full page color prints. I have checked the toner, the imaging units, cleaned the LEDs, made sure the paper type matches correctly with the media I am using, etc. Nothing seems to remove the streaks. Any suggestions...
Thanks, Dave

Measure the front edge of the defect to the front edge of the next defect, then see what it corresponds to.Measure the front edge of the defect to the front edge of the next defect, then see what it corresponds to.

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I've refilled the toner cartridges a few times now and never had a problem with vertical streaks until recently. I refilled both the cyan and magenta and when I ran the test page I had dark vertical streaks on both sides. I fiddled around cleaning things, running cleaning paper through, changing reset resistors but to no avail so eventually decided to buy a replacement refurbished cyan cartridge since the streaks looked mainly blue and bingo... well almost now I just have very light magenta streaks. The issue is obvious when I compared the old and new cartridge, the replacement toner is a much duller cyan and is of the wrong consistency since once it's been in the printer everything gets covered in it which is why I think it causes the banding to occur. I'm just trying to work out now whether to try refilling the magenta again (v. messy) or just go for another refurbished cartridge (£34).

Developer streak
Developer streak is characterized by a line of dark or missing toner
that stretches from the leading edge to the trailing edge. Replace the
toner cartridge corresponding to the color of the developer streak (for
example, if the streak is magenta, replace the magenta toner
cartridge).

Repetitive defects troubleshooting
Repetitive defects are defects that occur in the same vertical position
on the page, but not necessarily on every page. Most repetitive
defects are caused by problems with one of the following, and are
indicated by the positioning of the defect on the page:
developer roller (at 38 mm)
charging roller (at 44 mm)—see additional information under
“Charge roller set” on page 454.
cleaning roller (at 56 mm)
developer DSD wheels (at 65 mm)
transfer roller (at 66 mm)
transfer drum (occurs once per 11-by-17 inch or A3-sized page,
or every other letter- or A4-sized page)
fuser (at 150.5 mm)
imaging drum (at 195 mm)
transfer belt (at 222 mm)

Streaks can be caused by a number of thingsThe fuserThe ETBThe toner cartridgeThe firmwareThe printer needs a cleaning.The slot in the printer.Incorrect Media.

Try cleaning the printer, use a lint-free cloth for the ETB, DO NOT touch the belt with your fingers, the oil from fingers will often make things worse.Always use a lint-free cloth, if you ever encounter dirt inside the printer, dampen the cloth.

Calibrate the printer. From the printer's control panel menuConfigure Device-> Print Quality-> Calibrate now.(Press the Checkmark key to advance through menus)